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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9a13edb4ef01d6a9d2cedcbfa54455c439a674843537cfc749f2b1514782d639' 
  AND token = '/m/qab5mYcSgG75TE0CPf2aJ/iG6TcHOvLOUTEQp8pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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