Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ed14fef15e4f57d6029dec5982989b2bba4cc4ae93365476cbc0f7cd026d1d' 
  AND token = 'I4gO3kAl0e8TJhDvf2kOY7ynsZ6pHAeWfRw7AaJ2Ve8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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