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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '59c51212b24ccfef74e2f1b5c593df5aed050581ed55fa0c0810e58f6005d773' 
  AND token = 'boArkvzk6gofhxaQnNFJYZjaaPLm24sMn2EQa2xGZmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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