Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e37659824ba3b3d6abe3bceb7d61b53c21ef894de9703de1c25d75aceda23e' 
  AND token = 'taYCt1l6XLXZ0ybSKNSrQ+j7bf9OpXoHWRAhFs1c5Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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