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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e6047f523870052d9edcf599d807491ca97a5b04b72c79f7c61fe4ec9da01158' 
  AND token = 'PZm7c/5QZryFJ3Zup2/83qGZ/BdbIOzkokjTvAdxTuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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