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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f305715d7700e3cb6c41a90358e94e6a5043cd464a40646b6bda87d3a1fd5d2' 
  AND token = 'JkQypkj7t7uHs0CbgrdiT4N7++SboCcQOThrqv9c1lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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