SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '69888d7e3b47f8036168d939b727615ef450ca2b1b409561bc1667300f902627' 
  AND token = 'Tn2VJO+bxct5xkrn2zo1iGMKzj7WOLEBFac7QXh8zIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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