Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f42c160a530678c149bcf6b83ae8c9d0ea9b1cef41335a3a0b2da28416d2ad' 
  AND token = 'RDUkyI7Fzfyoy7QKhHMypkuoFIdIW+QQt2vjToZSN9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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