Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4871ebe71e4118943f43fc64773537b6baa21501efa2314092fffac3bfe050d1' 
  AND token = 'VDFzYcMDWKbfCOmxgBvWmuOH4u8+0/SULtEt4fZXdcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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