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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bcfa68fd6a64fd7c1a40effeed468d861211ec1fb87f9cdf4dbe9d11ce115bb0' 
  AND token = '+/GRFzbs9HGEQq/CNhpW6ITfwo+srmQrXhev+bQdx9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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