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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3406ee5ff0114ec09f8f383dfc5597bedb616b09873a7e7e513f45b930070381' 
  AND token = 'xiqoU/cqHcpNP8QIWjuGgeMqgOuNB0H64/s4l4hJUd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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