Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf20a3f0f3eea6a5b60ec03b1e2d30cbfd193884ead21c571c40ebf8d655d09d' 
  AND token = 'UVUB0oop1CUodWkhYWQWMSdVXfbBDvM7EFKJf8vr+XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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