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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ba71cdcee7dd435ad53839ccc4c80d9d233932d8ce650e65aa3edf466a7d2f9' 
  AND token = 'UjzaV58lh/n0XGhG0RTQkVTZ01Pe+bza5iJlxb+hZkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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