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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '74449aac74d8e093f8993bd732e94fdde007141c28b8b9b4b9c6cfb48b0e2dfc' 
  AND token = 'HvgboU+3r9cp+2sAAwbN1NjSwvsuDsjW6/4njo7j6wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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