Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e844d0a50ae78ec580cb7f4ba788c9deb9879e1d08e4b26f568d1bf5f12816a3' 
  AND token = 'HlnKsMSi+vUC0Y4kM14FTyofPQXKgaSzLf8X13vzd7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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