Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64727714903513c1f2149d1e00c3c2ce541db7c94489facaa4e289570cfd2328' 
  AND token = '6IRYWMeOduKKjnyCtvDTNdVbzSdKCVQ5vDm+8+cnARc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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