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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '68eaae8f9f6b3dd45dd1d4dfc966c679669523db40c3d22176a871a04141ee79' 
  AND token = 'FPUKE2lbquolYFXtRB5HGM8ypSukhSXDmhadIrndaPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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