Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e566f7b52bbe9ec31aa1bd92ff873df78e0040fff918e435e52d3da94040c25' 
  AND token = 'mOxhbsM+qtWF2P09SIFhziOUlPPjSdPldze3FtDX+gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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