Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a1de0dde07df921bbb0a364100d398aad6969dfc44c83497dbdb2d5c960ea3' 
  AND token = 'G2N+RJm49sIK6FLeq2/c/j0wlkWp/8q6ZbfdCBusJ/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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