Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc157e631c514e9d3fc30d09a8accb91e8a5f05333cbe35a6f3ef0302c577dfa' 
  AND token = 'oqQ5/z9Y6wUqF4nVFcxfkkf9NXSLBNLNdZasPJyHKxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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