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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '324552ca226d540e9dffe795acb18191b3d9261932f3590a43a26ec877d4263c' 
  AND token = 'E5P8ow5dCLJpGiZemCddEI2DJ0pwJFjdqW7bt/kV+v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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