Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98829d3eaeb00eac3cc2b1d8e6d3b2cbdf32407f40fe8e7b4b4dd69ebb68e281' 
  AND token = 'pDRIYCd6+PlvqoRi8VhcRo/c2UC8zgY7Qm0LjGIXoRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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