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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e940292d13dd0e095b4b24f90cbe55e8cbfdfbaf19691ff4e245db497050059c' 
  AND token = 'RCE5xUW2qutDN+eNDDrJYZhxBHsKeTxL0a6MZTv3soE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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