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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7e19a783617ce772c36d8f7b7b48f5ab66180a5596cab7ed68d7e20cacb180d5' 
  AND token = '/SIrTiqitC5Qnm/JEYc2jBt1sJbYm66P14SdNDc59b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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