Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fdd14d9bdaf7504a80ca76f03d7182b9e81efbc9ba5a1ad29b8d9ac2c6f1830' 
  AND token = 'QoypxewZILCs43j+yTBpDh/uCdT43jZjFtPT6TCYW4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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