Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138debd39d532d564f587768682394459fb72e7b992677d7d606f25d12b4b8a7' 
  AND token = 'MKbDbGVDTxotn7ZV755+iaHHAoLFtK71+ZLB4b1X9os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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