SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e52ac53ff30e6694d8518df51acebb41f200fd3d9d1413aa8be52b372060497e' 
  AND token = 'BiO2Pt97vWJSCT2sI3qcl0hMPXsVNBUm5KiO9F2lb0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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