Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e854eeea3c02990742f03cb0659944bf7865c526aaeccaa1073ded2a3f0e28be' 
  AND token = 'qjt4fuSj/P9Hx9GD9Jwtd9IQq5pMOdIjrE7CrvEko78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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