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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'bd9b07f3a66b3da898c9aebc1f6c63b8e18b0960f49e33fc88b9191141e8cd3c' 
  AND token = 'SAvMVUGdJW2sdo2uUN8mGARiBm4nLkt5PqxV5WVzAas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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