Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1da9a68335fbcd3a8febf35c283ad42c3645c2c2b41a38338bb5908f81b2a67' 
  AND token = '0uWlwFAFh22vMYJCdM6ExDSrx3iRJYfqQn+QT3SmQJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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