Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23936317209678d41bf102001521675791a74eb930a25a3ead144784fefcd85' 
  AND token = '/5y7dtSpMWoVmju45BlW5OtPND+R78PYm5TlmRetXHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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