Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c787ab39928fd808ee77fe5cf521bde6bd8394b7fcae913a617afc502074242' 
  AND token = 'I8CVpTprvMiH1ntdK723HDj3FEq6GZ82G2NTTKo6Xs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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