Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f4c27ddceddd9b5c1378dbe8edbb5fe4c71e3b5293b1def7f73b7831ba8061' 
  AND token = 'FF51DO70AnOGJkdC20ST2jSuSq1JyRIDoz32Lkl4IIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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