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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8584a6f0a4755d2c56a0a3f68394049f002667c82e0f8fbdaab7e085d43f6ae' 
  AND token = 'tSxXHNEVPLaGD3UVxZu6ifX5l6e+zMGE4QYcHOOnkXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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