Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '423772e117e45317640788d6a76e039af0c06ec6ac02b02977212f46fb56cea9' 
  AND token = 'oV4vHaK7rUkezWTCgsRSprEfRC9i0uM9iTjSJzz33pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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