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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '98654ee835905bed281d9d5f144bd15e8fde5ba0647067cb2af2389ec6b45dad' 
  AND token = 'WiZJdNpmOOn2+TnHz7IMNO6Kby6yM5s/bJ854Le7Js0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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