Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7362edc5b4206dde88740eda1cccae4a092f364e29fa41400815af15395ddc' 
  AND token = '1YsV1xMoZTSWHWpyBPVzOlfPdbfQ/tUX0Ep0Zvzbu80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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