Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712a8ced48ed6a2557d1f96007ba9ebde8781f46411c80fa019d350c2c9de377' 
  AND token = 'WWWpK0ZIXUYl569Efwh7v4TqJ/cKreTtWebjfH16cRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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