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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5f3bb0f04baf6c528237bbf7f828f5635de77bf9d82563cb4a409b1b93f66146' 
  AND token = 'JSQfgy1z4h9+ewuja05/bPbEWZHJMmuHvoEM7rQCJcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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