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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0613c159df04e7a66407070ed41db2f1c40101adbc923a70ba9e3c804951b2ed' 
  AND token = 'gpxjBG3OiwJ43xl3O4ba19zxm4axbWz7v9hIfEG6PRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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