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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5794f801594244c15f64150bcb2911decc6eae4b13541ee17f9cce69c169b689' 
  AND token = 'vO6OtMxmt6vvDT+cW0f/M9USqGJmHNKpocE+tfnQylw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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