Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e40088b90d3dbabb34f8b08f1fccbace393ea97c520115c4380694fedd72acf' 
  AND token = 'R88u2Smas2I88aIAIesr9LaDNejgcPd1fMHpphROLtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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