Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fa48f68d768475c7d47dfe6849eaf22a9b83e26a68494ef594535096d72a6a' 
  AND token = '0R3/luA8NriB7KTLBKxL1NhuuPU9R1GnNgsngpf4VbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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