Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21512df1bef89f33dcb7520745ecd4d5561d0cca4a607e2d72f7feaa29d38498' 
  AND token = 'YKjtqmyzG8FIA1Xg9/xOyiTUiz70geXakk1LDn26Vo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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