SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '24d10c076d895091752779db0b8a062d885b23dec6b489826f21794125b20283' 
  AND token = 'Bv4Sn/f5gv5yjoS5WlXxRprLJlDwi9XNjUWRRT8OXA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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