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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '70a89a2d366998abb34394b0051e60aef8823dffe8088ac97e453ba7e75f475c' 
  AND token = 's483OdzENKpaGKLkWIPKEgmGBlbnw48kkHlyMp1mBeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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