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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e133dc16e9c42f961107a21a9ab7eb5860c53a3370e9b5719ef58d39e9956147' 
  AND token = 'PHyH6Q/Btcn8qtInER6IbsF3IXSVCxdnnb7HhEUbSZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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