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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e1a3dc7d2baa5fc502039010d93a6db6db0208aa5af047f8fddb2f7d164fe696' 
  AND token = 'm8eDNBpO7xgamn70M+PV+4zc2DaskxYlfDafkSOh8N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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