Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb8d828dde7bdf3b124e6456cd2d5c0b3d443c0ad8369aff3b3f5d945cab159' 
  AND token = 'EBIu4HR+4akEV0YelyjGqyhKoUgTQ0YtMKq3Kyf5Y50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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