Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c4b48de31c7a00294d73c52a0385b3d43ecce351d2a3d0a72153736bd120c3' 
  AND token = 'vrUFpD1dxfuwdg0nksALRJjkZF958h3zRevh459ski4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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