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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4f9aeb061276b64df5117c395accd27a0f97de80e11786cbb39a8705c1ee27e7' 
  AND token = 'qcqYyug4xGSBk96p4MxgdPzkfQ5bJbwMD23CuNs+pDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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