Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c21de326cd77e438916842459c23292c10f71e740d1c6ca941a1f99a7881cd' 
  AND token = 'bU3ngjYQpDj/7NwCY8LFKlELJVMosZUv0XN2d7W0GlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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