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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '46b38dad636a5e9b24a345e26228d1e956eef832aeb0952eef990dd60245840c' 
  AND token = 'nkrx8JXm6J4NRPDyFuhIPRz2HVOV22JsHLGT58phiF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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