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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fd3f97296c6cdd78ec67a6f65b92d6a5ea0f0f14a9edc68469a24050c5e7e9c2' 
  AND token = 'aej89E2ptKa4NjXD8T3zvqCMLktTr1HZ09jB7Ov0qCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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