Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ad4dbc711ce5be63a1d44038d9b0e756bf995db82af4ea8d696246459e2c2f1' 
  AND token = 'nVmszU3vzmn0IAjISTdIGLsePTf0jyAr89MbTfcTULQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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