Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4148ff36a048a74c8d20f723051581863e480797807e129369b83b0dfd3e9f68' 
  AND token = '3jVF3EN7jXcu/lQldQz0cG5aKJtzdcMFoMDucHpwTYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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