Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee77d76b2fc582fe56af6467c565752ce087ee82732f88ce36ea95d75924cb0' 
  AND token = '29JajTzAHgW/xFUW3/x2wGiwMswZATzWTUSdb9iGRyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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