Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81621d537a524909006f66b3a51c130da96c6663a148d9ba0a55baa42a268d86' 
  AND token = 'nFKr5DsEJXXASxmE5dajsIulV5T7SIQC3leeRFa95hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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