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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2f728bf42ed6870111fd1d8042521a0ad06bad57c57e4eba34fcd9622d1265a7' 
  AND token = 'MsT3LEzbVfF1CXmK64SLDdZ0f1jUF7xabOM6aRGpVlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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