Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c5bcd8b76203860d81cf9a07d527290edd8712d21a1afb3252ef8ce225bbd9' 
  AND token = 'yFXgrYF8Ulkz5+XdssfDOudIuOOahPLMGf4P5PLrrLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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