Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9b1604d314826c0f16cc1e953cb477655c399944c6d046a77756c8aa2c80eb68' 
  AND token = 'JnnFp/vdW4ljYzo7ttkqCa4xk3p8Ut0AQ2IJF40VQH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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