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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a98c54ff23e030f0045f97b1c0324b1597093030f2ee62db98b00d7840818659' 
  AND token = 'YpIalS9qN7VhGo34505NwEG0bUS7hXxGdHMs2785M9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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