Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f66b5a1f53afdcad310e546ba76aef7f7e4f1e47f079513660145652edb1b51' 
  AND token = '4s3xkm4VLa7gSG4GqM+Km9VsjkcRmAuy+xjikD9vKsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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