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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6e7839ae683dc5b7ab090047798ee0ab7a05823f0f6528e60beefa7c9074377e' 
  AND token = 'sVdCugjeYBN+wZYQx3HA/SMpxKuiyDNy7pdQH6NlZ0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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