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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd38d37abf5e7457c673a4b1cff81fbef34eae719053a4383460dd5378bd83e70' 
  AND token = 'MvhLyiJC1yfpK+mc4UJFp1wYtOozeF60/Tx0dsxFebc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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