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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '18c9327ce8b5e5faea4170b5af9a3977077091df942399a95184cb59557e0324' 
  AND token = 'cqTxiqlG7krHAlZLjPJ5RkuQqiq5S8FzgCTisGB7UtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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