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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc63751022fc10c99a6cc8e3f71f92df69577d1ed732572cb56c35bd86a5af9f' 
  AND token = 'sr587RMbGzbboVEgu8happ/lu7wE33hNax2dB2LnASk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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