SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b97b7e9b16e9519a55ae5aec445711d3861708b52de9086bba4ce11fd22e4898' 
  AND token = 'grqzNMA27FEIqjnm/BkMZM93Bs1GVQHR9ng7PxC3gjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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