Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4808e871fecf672a74c70e4d4605dcb507ea1f0508740d9358b234227ba15c3a' 
  AND token = 'V6ZhaYZs3m4yPuncaMZrMtXK1jqsDmavW//h93GdRqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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