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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9a11c41c03360f883b3a3a35b488146ace90ed0b05ac0d9f91a60705bce119d9' 
  AND token = 'UksjiN8kkCojr6tdhxVielN8dSBSt3KTr3zL4VwtRF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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