Sandbox

SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8e1c9415b600e4c6e2640faf4f83116502d02b332dc4346407e7a849ad752015' 
  AND token = 'kumN02sx485NeArp2mM/pKsItMAcmfae8fBArXDunWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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