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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd8a29af6dec891c9d37aeba9ecc827ab9511cb10b21b8b467f90f6816d357566' 
  AND token = 'e/oftFabnTye8zrzkyRx+LdtQ2h1tnvOogRnZ63dNc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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