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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9f47ab832702244fd805a95ed0088fa999b849ff7a0f6b7e8b0c8dcca728769f' 
  AND token = 'LLWiO13PCH3M0zIHYRvIinqZDCJ5J5AaNEAO7vZwMfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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