Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5484cb3e3156b1895648f78af3dd0d307218df6394a197e7afd8d420c8efa8' 
  AND token = 'TrcChTkbyOCdIKSwU8s5Sk1D1cWEyy8tEDIj2KrQrzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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