Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7a42d5d27556ebcb3b12fceae1d2b765eeed182879faf2e81668dd52849d2b' 
  AND token = '5zOxOKEBYP3jsfZ3f1ZHNWylzFoTFFR+E+aVxzZAUO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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