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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e6e4642398ee0ce54f9956f912d2ea73d715c32f61bb23a291fa50404d3f7c3' 
  AND token = '6WYyPalhOOte+4xli9eIdzxH9SZ8/SZEf4rJhge83+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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