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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0913d55f4c122e95423f709f5352eee592e79610a7b06929eb0b8d909f4a3a33' 
  AND token = 'NiUSVldMgoJd4p65a03i3Nu0sJqoO0S5bTUuM/qFByI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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