Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a321047356822c4bfbc5ca34da82b0f683ad1c1ed51670810bfa33081a1bbc79' 
  AND token = 'wEBJP3ybCgqyeaD8xwllW4wj7G3R1L/m5Tl6Ja6RdzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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