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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'adde68c0520268eb363a8c04deb8d2f278e8f01952d3f9c87c000d4b1671a645' 
  AND token = 'RwAFeR4Eo9CNdhDZSKx6F80G/R2d9eZa6ZtTSS442gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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