Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b7d6eb9d68cb49876716d32ece44c22cb8d11a2f8bc2200056afdeae6c330b' 
  AND token = 'JhYsmikDN5y1ErJPIZWvDC+qtTer6+CwDdc+9uL2Q6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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