SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0281b6d7d18ae4b8816e443438f5c6ee4e9602a32d4b2d7ff037ee812aa8c69d' 
  AND token = 'goHgRm7irXkPSfh8w+J1P4/fYCIml59yvEYeIJhD9GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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