Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ef28a1ccf2fb0cb18c4ed678e3f8ec75c27eebc081c4b01cce4424cb27d6e2' 
  AND token = '5peutYxXEoQ27hBVnigkfxThx32jqLI1j9FVNobuhJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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