SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '95125b0d88f4792172f3110cb46070c8268713017927e8622a0833a69e4dabf7' 
  AND token = 'aJstq/9td6TEYiLTs0c+YV/f2asP1B0VUOcgBzj7WJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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