Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e65b40bfab468e13740966430d84b0d8a2e3c4ce5ef974790f3bdce4e49461' 
  AND token = 'XwrcM712NVIefYEKeqgKXpro0mky0js0d3afWLb3ATI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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