Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471e92981744ede866422b61804b6d53af6cb2150740841be3ae195ed64728b1' 
  AND token = 'DzFQHgtNQb6vNeOSlO4hRKPADewivp91Sr2s4nTtrf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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