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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8411493b1ec30ab7c82eecfa73c5bc46438c49948c7d96a0f00ce430ab4812f3' 
  AND token = 'EUzlF/vX0F0tMucPoXsc5bxEiqjIVyyoIkVBOukG5ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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