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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '66853fe30f8fdc3ec9d30a1ee27061b331d128409157137783b342bfbea51789' 
  AND token = '3kez4yrfPHIBzGjWs3fn7K+NuOyHLbD8FI29FXZVts0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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