Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ec2530f146ae8015bde86bc5699f5791502167a250dc521a6240e9b4fca7f5' 
  AND token = 'dAcKRglvep4YWfayjmYB8hCQjrKQt7IEt62d2XSNzDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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