Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5764d2efd8024c7920652f8007318728997d37aa700d1a4d530d2222258595d5' 
  AND token = 'Czo+hlRAS+ogEqnIs7imXW95EtB5MeFi5oZHYgPBqjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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