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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd84b93bcea88e8471a490d1e5b74bd87c2a6cab85e011bfc40358193259acd92' 
  AND token = 'cICKT7pYqRVNzyb/4lmYI6kAM+iUTEOc/c6wypmQrXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}