Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e51c83dbad31217091d0d2f28e063a2f272f93c9308bea9f380d42419204902' 
  AND token = '9DcQdFz2oCBeDMRLicZNOW6+mo0hqwPrlijgMLMG18A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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