Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a0fd4e7ff52535005c4d0ea01ba6e7a89f24ced89abe2af12416f2ff3d1c6d' 
  AND token = 'X5wSlyszaFgBFT2KaGyifh86sl54K2pGXzIhyjw2OG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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