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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9f7ff8966dad958776108ba01085c92575131139723cc335dde8a6b091521760' 
  AND token = 'Wd9zJ2dd1Qmp0uEE+czOQO5qmOQ52rT1Co6yRREQ6Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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