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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4f3deabe0c109d1cfe03556bd21606106c8aed737b3255c119632bc626a4a173' 
  AND token = 'p+GffTMcOAoHPsgyx+yQcn2a/ujpGn7FHxpW0N6HtOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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