Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939a38d33e77838f3dd8d488572969f8723568be3bab3b52d30407a4095b0c63' 
  AND token = 'Ri6E8M3lhc4YpevusxsS+GpGu7jt+QCGMA9qjIKwkGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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