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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b50cd0ade2f2bf1a3bb6750e2acf7018ce610ccb9d64892b3299155166bbdd73' 
  AND token = '047FsV9R6YATA2cWhTIoUn2WN1xulUAVIx0SCqSZMqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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