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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9a6cbdb37285a4b978fc7ccc2900b467d666ff4a08397eef34d9f1a35bcdd50b' 
  AND token = 'UdH8KW/k9om2HIJpe626fr0T+bQTTq2nN2QUhNi6VyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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