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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f824a09d6da51ea3b2f3a49fd5ade6fe6f97a7065f39d8aacb0b2debca7d1c41' 
  AND token = 'ybg3TMymLi59ZTKCljMnzexDuEFIl6jgzPe031o+ESU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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