SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd3e58652ff02f448f07c7e93698dcb79190a5328786160df3577de9c1e439903' 
  AND token = 'j52mgUc+H9JRuQzeuCrzsDWfNepKHYErBa9f05x/MSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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